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ffb254a2 - [tests] refactor test_models_unet_1d.py to use modular testing mixins

[tests] refactor test_models_unet_1d.py to use modular testing mixins Refactor UNet1D model tests to follow the modern testing pattern using BaseModelTesterConfig and focused mixin classes (ModelTesterMixin, MemoryTesterMixin, TrainingTesterMixin, LoraTesterMixin). Both UNet1D standard and RL variants now have separate config classes and dedicated test classes organized by concern (core, memory, training, LoRA, hub loading). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>